TOM BIHN has introduced a new size of the Cache sleeve specifically for the new 11-inch Apple MacBook Air. The case is form fitting foam padded and is available for pre-order. Here is more info on the Tom Bihn MacBook Air 11" case:

The Cache is designed to protect the Apple MacBook Air against scrapes and scratches from all sides. It's 1/4" (6mm) thick foam padding laminated with an exterior of four-ply Taslan and an interior of brushed tricot cradles your MacBook Air. The Size Air11 is sized specifically to fit the Apple 11.6" MacBook Air. Made in Seattle. Lifetime Guarantee.

Available for pre-order; ships by early November. $30.

The Cache is also available in Size Air13 for the 13" MacBook Air. Size Air13 fits all models of 13" MacBook Air and ships within one business day.